What type of system would typically use pneumatic controls to manage process variables?

A pneumatic control system is specifically designed to utilize compressed air to control various process variables such as pressure, flow rate, and temperature. Pneumatic controls operate by using air pressure to generate mechanical movement or logic functions, making them particularly effective in applications where rapid response times and simplicity are essential.

The use of air as a control medium allows for systems that can easily be integrated with actuators and valves to effectively manage operations in industries such as manufacturing, automation, and process control. Pneumatic systems are often preferred in environments where dust or hazardous materials are present, as they can be safer and cleaner compared to other types of control systems.

Examining the other options helps illustrate the unique suitability of pneumatic systems. Hydraulic systems primarily use liquid to transmit power, making them unsuitable for pneumatic control functions. Mechanical systems may involve physical linkages or gears but generally do not provide the same flexibility or responsiveness as pneumatic controls. Electronic systems rely on electrical signals and components, which is a different approach compared to the pneumatic method that utilizes air pressure. Thus, the pneumatic control system stands out as the appropriate choice for managing process variables effectively.